(M20, M30 Engines) - BMW 1989-1995 525i Service Manual

121-4
BATIERV, STARTER , ALTERNATOR
B+
8 11186
Fig . 3. Alternator terrrnnat desIgnation.
To remove and install alternator
Various alternators with different current ratings and from
different manufacturers are installed on E34 5-series cars.
Replacement alternators should be of the same make and rat-
ing as originally installed. Alternator manufactu rer and am-
pere rating are marked on the alternator housing.
1. Disconnect negative
H
battery cable.
2. Remove alternator cooling duct and air filter housing
assembly from car. Disconnect wiring from rear of alter-
nator.
3. Remove radiator cooling fan and fan shroud. On M60
engines. remove radiator mounting clips from top of ra-
diator. See 170 Radiator and Cooling System.
NOTE -
The radiator cooling Ian nut (32 mm wrench) ha s left-
hand threads.
4. Remove alternator drive belt. See 020 Maintenance
Prog ram .
5. On M60 engines. unbolt oil filter housing from front of
engine.
6. Working at rear of alternator. disconnect alterna tor
ducting . Remove terminal cover and discon nect wiring
from alterna tor.
ALTERNA TOR SERVICE
NOTE -
On
M 60
engines. disconnect the alternator ducting and
loosen the lower pivot bolt Irom below. It will be neces-
sary to remove the engine splash pan(s) to access the
underside 01 the engine.
7. Remove upper adjustment mounting bolt and lower
bolt(s) from alternator. Protect front of radiator with
heavy cardbo ard or sheet metal. See Fig. 4.
•
00 1 52 1
Fig . 4. Alternator rnoununq bolts
(arrows).
Allema or rom
MOO en-
gine shown. omer alternators are similar.
8. On M20. M30. and M50 engines. remove alternator us-
ing care not to damage radiator.
9. On M60 engines. remove coolant pump pulley. Pull oil
filter housing forward while rotating upper alternator
mounting clockwise and under oil filter housing mount -
ing. See Fig. 5. Rotate alternator forward and then out
of engine compartment. using care not to damage radi-
ator.
10. Installation is reverse of removal.
NOTE -
On
MSO
engines. BMW special 1001 no. 12 3 100 is
available to aid in the removal and installation 01 the al-
ternator pulley. The special socket tool facilitates hold-
ing the alterna tor shaft with
a
hex key while loosening
and tightening the pulley nut.
Ti ghteni ng Torques
• D+ wire to alternator 6 Nm (53 in-lb)
• B+ wire to alternator 14 Nm (10 ft-Ib)
• Pulley to alternator
M20. M30 engines 45 Nm (33 ft-Ib)
M50/M60 engine 55 Nm (4 1 ft-Ib)